Roof box frame haunch joint



Oct. 7, 1969 I H. H. JOHNSON 3,470,

ROOF Box FRAME munca JOINT Originai Filed March 19, 1965 2 Sheets-Sheet 1 f VENTOR.

HARVEY H. JOHNSON w a I ATToRNEX Oct. 7, 1969 H. H. JOHNSON ROOF BOX FRAME HAUNCH JOINT Originalfiled llgroh 19, 1965 2 Sheets-Sheet 2 WM M United States Patent 3,470,661 ROOF BOX FRAME HAUNCH JOINT Harvey H. Johnson, 7851 56th Place NE.,

Seattle, Wash. 98115 Original application Mar. 19, 1965, Ser. No. 441,082, now

Patent No. 3,346,999, dated Oct. 17, 1967. Divided and this application Oct. 16, 1967, Ser. No. 675,374

Int. Cl. E04c 3/38; E04b 7/02, N32 US. Cl. 52-93 3 Claims ABSTRACT OF THE DISCLOSURE Downwardly-tapered column portions of the roof frame support upwardly-convergent roof beam portions disposed at obtuse angles to the column portions. The haunch joint between each column portion and the beam portion of the frame which it supports has interfitting stringers crossing at the interior angle of the haunch joint, the portion of each stringer at one side of the intersection constituting a chord element and the portion of such stringer at the opposite side of the intersection constituting a web element.

This application is a division of my application, Ser. No. 441,082, Mar. 19, 1965, now Patent No. 3,346,999 for roof box frame.

A wooden roof box frame to which the present invention is particularly applicable may include a crowned beam section, opposite ends of which are carried by upright columns tapering downward. The beam and column sections include plywood cover pieces forming web plates spanning between and joining opposite chord elements. Web struts disposed between the Web plates connect the chord elements to stiffen the box structure and, in certain instances, serve as splice members for reinforcing joints in the plywood web plates.

An object of this invention is to provide a roof box frame haunch joint which is simple in construction, easy to use, well adapted for its intended purpose and relatively inexpensive to manufacture.

Another object is to provide a haunch joint which efficiently transfers all of the chord stresses between each column and beam end supported by such column without reducing the stress-carrying capacity of the web members. More specifically, it is an obect to transfer such stresses in a haunch joint by the combination of lapping and dapping web members and reinforcing such members by a faceplate of plywood which spans the joint and the opposite chords of both the upper end of the column and the end of the beam supported by such column.

FIGURE 1 is a side elevation of a roof box frame including a haunch joint of the present invention, parts of the frame being broken away, and FIGURE 2 is a section through such frame on line 22 of FIGURE 1.

FIGURE 3 is a fragmentary elevation of the haunch joint on an enlarged scale.

FIGURE 4 is a top edge view of the joint of FIG- URE 3 as seen from line 4--4 of that figure.

FIGURES 5, 6, 7, 8 and 9 are detail sections through portions of the box frame taken respectively on lines 5-5, 66, 7--7, 8-8 and 9-9 of FIGURE 3.

The column 1 shown in FIGURE 1 supports one end of the beam 2, which is inclined upwardly away from the upper end of the column. The junction of such column and beam is provided by the haunch 4. The base 3 of the column is secured in place by an anchor bolt 7, which can be embedded in the foundation and projects up through a hole in the base block 9. A nut 8 3,470,661 Patented Oct. 7, 1969 secured on the upper end of the anchor bolt is accessible through a handhole 10 in the plywood faceplate 13. The column 1 includes the inner chord member 11 and the outer chord member 12, which are joined by faceplates 13 on opposite sides forming web members for the column. An internal transverse strut 14 also joining the chord elements constitutes an additional chord member which serves to stiffen the box structure and to form a backing for a joint between the lower faceplates 13 and the upper faceplates 20 on opposite side of the column 1.

In the beam portion of the box frame, the upper chord member 21 and the lower chord member 22 can be formed of glue-laminated strips having their opposite sides joined by faceplates 23, forming web elements of the beam. The beam can be formed in sections with bolts 24 connecting the chord elements of the beam sections and bolts 25 connecting web members of the sections, including backing web members 27 and 28 for the faceplate joints 26. Such a beam joint is spaced from the haunch of the frame and from the crown to locate it at or near the point of zero bending stress in the frame. The whole assembly, with the exception of the column-to-beam splice, is formed of members joined by adhesive, so that the two splices in the beam at opposite sides of its crown are the only mechanical connections in the frame.

Details of the haunch structure between the column 1 and the beam 2 are shown in FIGURES 4 to 9, inclusive. The chord members of both the column and the beam at, and adjacent to, the haunch are formed of laminated stringer elements, four layers of such stringers being shown as forming each of such members. The outer chord member of column 1 is formed by four laminated stringer elements 12, as indicated in FIGURE 4. The upper chord member of the beam 2 is formed by the four laminated stringer elements 21, as shown in FIG- URES 3, 4 and 5. The ends of such upper beam chord stringer elements are shown in FIGURES 3 and 4 as extending over the ends of the four upright stringer elements 12, forming the outer chord member of the column, but the adjacent ends of such stringer members can be interdigitated or mitered, if preferred.

The four laminated chord elements or stringers forming the inner chord member of the column 1 and the four laminated chord elements or stringers along the bottom of the beam 2 are interfitted in balanced crossing relationship at the interior angle of the haunch. Such chord members then continue from their inner section on through the column and beam respectively transversely of the lengths of such column and beam to function as stiifeners or struts. Such struts serve to transfer horizontal and vertical shear through the haunch between the column and the beam in an effective manner.

As shown in FIGURES 3, 4, 5 and 8, the inner up right chord of the column 1 is composed of two side stringers 39 and two central stringers disposed in registering laminated relationship. The side stringers 39 extend along the inner margin of the column 1 upward through the beam 2 transversely of its length, and their ends terminate in abutment with the lower edges of the stringers 21, forming the upper chord of the beam. The central stringers 40 of the inner column chord member extend up to the lower chord of the beam 2, and there terminate in abutment with the lower edges of central chord stringers of the beams lower chord. In continuation of the alignment of the stringers 40, central stringer sections 40 extend between the outer stringers 39 and in registry therewith from the upper edges of the inner stringers incorporated in the lower beam chord to the lower edge of the upper beam chord, as shown best in FIGURES 5 and 8.

' The lower chord member of the beam 2 is composed of 'outer'inter'rupted stringer elements 41', 41 and central through stringer elements 42. FIGURES 5, 6 and 7 in particular show the central through stringers 42 as extending along the lower chord of the beam 2 downward to the column 1 and then through such column transversely of its length until their ends abut the in ner edges of members 12 in the outer chord of the column 1. The outer stringers 41 extend along the margin of the beam 2 and their ends at the junction with the column abut edges of the outer through stringers 39 in the inner chord of the column 1. Stringers 41 extend in alignment with the stringers 41 and in registry with the through central stringers 42 between the inner and outer chords of the column, as shown in FIGURES 3 'and 7.

By use of this type of construction, it will be understood that the outer stringers of the inner chord of the 'column 1 extend uninterruptedly through the width of the beamand the central stringers of the beams bottom chord extend uninterruptedly along the bottom of the beam and through the width of the column. In doing so, the central stringers 42 of the beam lower chord pass between and cross the outer stringers of the columns inner chord uninterruptedly. Moreover, it will be seen that at each side of the central plane of the beam and column parallel to the faceplates 20 there is adjacent to such plane at its opposite sides the two central through chord elements 42 of the lower beam chord and outwardly from such beam chord elements at equal distances from such plane are the two outer through chord elements 39 of the inner column chord. Such arrangement of the crossing through chord stringers thus forms a symmetrical arrangement of components so that the haunch is balanced structurally. The additional stringer sections 40' and 41' then serve as filler pieces to complete the full thickness of the strut sections extending through the column and beam transversely of their lengths.

The faceplates 20 of plywood covering opposite sides of the haunch, as shown in FIGURES 3 to 9, inclusive, preferably are disposed with their lengths, and consequently, the length of the grain in the face plies of the plywood pieces being inclined to the lengths of both the column and the beam. The lengths of such faceplates should extend generally diagonally across the haunch so as to form gussets at opposite sides of the interior angle of the haunch. The corner portions of the haunch can be reinforced by supplemental triangular gussets 43 shown in FIGURES 3, 4, and 5, overlying the comer portions of the faceplates 20.

t I claim:

1. In a box roof frame, a haunch having a structure symmetrical about the central plane through the haunch parallel to its principal surfaces and forming the junction of a column including outer and inner column chord members and a beam including upper and lower beam chord members, said inner column chord member including four column stringers two of which are through stringers disposed symmetrically at opposite sides of a central plane'of the haunch and which extend upward through the beam transversely of its length so that their upper ends abut said upper beam chord member, said lower beam chord member including four beam stringers two of which are through stringers disposed sym- '37 I ii metrically at opposite sides o f the central planepfthe haunch and which cross the through column stringers of said inner column chord member to form an intersection and extend outward through the column transversely of its length so that their outer ends abut said outer column chord member, theother two column stringers of said inner column chord member being'in'terrupted with their upper ends abutting the lower sides of said two through beam stringers, respectively, ,of said lower beam chord member, the other two beam stringers of said lowerbeam chord member being interrupted with their outer ends abutting the inner sides of said two:through column stringers, respectively, of said inner column chord member, filler means extending between and abutting said upper and lower beam chord members in continuation of said two interrupted column stringers of'said inner column chord member, said filler means being disposed in registry with the portions of saidinner column chord member through stringers extending through the beam for forming the thickness of the portion of said inner column chord member within the beam above said intersection substantially equal to the thickness of the portion of said inner column chord member below said intersection, filler means extending between and abutting said outer and inner column chord members in continuationof said two interrupted beam stringers of said lower beam chord member and disposed in registry with the portions of said lower beam chord member through stringers extending through the column for forming the thickness of the portion of said lower beam chord member Within the column substantially equal to the thickness of the portion of said lower beam chord member at the inner side of said intersection, and faceplates bridging across the internal angle of the haunch, each faceplate covering one of the opposite sides of said inner column chord member and of said lower beam chord member, spanning said intersection and extending a substantial distance beyond opposite sides of said intersection.

2. The haunch defined in claim 1, in which the filler means are stringers laminated in face-to-face relationship with the portions of the through stringers with which they are in registry.

3. The haunch defined in claim 1, in which the faceplates extend substantially to the outer and upper corner of the haunch.

References Cited UNITED STATES PATENTS 2,187,009 1/ 1940 Beattie 52642 2,390,180 12/1945 Sahlberg 5293 X 2,607,959 8/1952 Brosenius 52-90 X 2,886,857 5/1959 Brosenius 52-639 X 2,967,332 1/1961 Donlin 52-93 3,191,238 6/1965 Olson 5293 X 3,263,381 8/1965 Dickinson 5290 FOREIGN PATENTS 247,390 12/ 1947 Switzerland.

HENRY C. SUTHERLAND, Primary Examiner.

. US. Cl. X.R. 52642 

